Quote:
Originally Posted by comptiger5000
Having 30s (most measure around 29.5" or so) on an XJ isn't going to make much of a difference over the stock 28s or 29s in terms of mpg. Do a little aero modding around the wheel wells, and on the highway, the taller effective gearing may even help. In city traffic, however, the extra rotating weight will hurt.
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I just looked up the stock size, and converted to inches, and you are right. Stock is 28". I wonder how my speedometer is 30% off... (reads 80% ish of actual speed)
I do a lot of city driving, so getting new tires would probably help by weight reduction alone... if I get lightweight tires.
On a side note, the comanche is an MJ, cherokee is an XJ. But they are basically the same truck.